An EDTA stock solution is prepared in a 1.5E+02 mL volumetric flask. The of the disodium dihydrate form of EDTA is 0.1339 g; the MW is 372.24 g/mole. A dilute solution of EDTA is prepared using a 20 mL volumetric pipet to transfer the stock solution to a 5.0E+02 mL volumetric flask. What is the concentration (M) of the dilute solution? O 9.592x10-5 9.59x10-5 2.398x10-3 O 3x10² 2.16x10-6
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- Zinc may be directly leached from zinc-lead sulphide concentrates by reaction with sulphuricPbS(s) + H2SO4 + 1 O2(g) → PbSO4(solid) + S° + H2O 21ZnS(s) + H2SO4 + 2 O2(g) → ZnSO4(aq) + S° + H2Oacid and oxygen. In addition, lead sulphide will be oxidized to give insoluble lead sulphate:Assume that a plant is to treat 400 t/day of concentrate containing 20.0 weight % Zn as ZnS and 110.0 weight % Pb and PbS. The concentrate and leach solution enters the leaching vessel at 32.0% solids. During the leach, 85.0% of the zinc is extracted and all the lead sulphide is oxidized. After the leaching step, the slurry passes to a thickener.(a) Calculate the concentration of Zn (in g/L) in the solution passing to metal recovery. Assume a solution density of 1.11 g/mL.(b) Calculate the tonnes per day of elemental sulphur produced.NOTE: â% solidsâ is the solids content of a slurry (consisting of particles and solution) and is defined as…A empty evaporating dish weighs 30.56g. You place 20.0mL of an NaCl solution in the dish plus the solution weighs 53.31g. You evaporatorate the solution to dryness ant find that the evaporatoring dish plus the residue weighs 32.25g. What is the w/v%? What is the w/w%? What is the molarity?An impure sample of Na3PO3 weighing 0.1392 g was dissolved in 25 mL of water. A solution containing 50 mL of 3% w/v mercury(II) chloride, 20 mL of 10% w/v sodium acetate, and 5 mL of glacial acetic acid was then prepared. The solution containing the phosphite was added dropwise to the second solution, oxidizing PO3^3– to PO4^3– and precipitating Hg2Cl2. After digesting, filtering, and rinsing, the precipitated Hg2Cl2 was found to weigh 0.4320 g. Report the purity of the original sample as %w/w Na3PO3. Moles Na3PO3 = moles Hg2Cl2
- Angeline performed an experiment on vitamin C content. She purchased bell peppers of different colours from local wet market. Bell pepper samples were cut, blended and homogenized with a fixed portion of water. Subsequently, coulometric titration was performed using iodine under constant current of 60 mA. In one of the experiment replicate,starch end point was achieved after 18 minutes. Suppose that bell pepper sample recorded initial mass of 115 g, deduce it’s vitamin C (176 g/mol) content in percentage. (F = 96500C)A sample of feldspar weighing 1.500g is decomposed, and eventually there is obtained a mixture of KCl and NaCl weighing 0.1801 g. These chlorides are dissolved in H2O, a 50-mL pipetful of 0.08333 N AGNO3 is added, and the precipitate is filtered off. The filtrate requires 16.47 mL of 0.1000N KCNS, with ferric alum as indicator. Calculate the percentage of K2O in the silicate.Gravimetric analysis of Fe3O4 (MW = 232 g/mole) may be undertaken with the following reactions: Fe3O4 → Fe2O3 → Fe (OH)3. Weight of sample containing 8.00% Fe3O4 that must be taken to obtain a precipitate of Fe(OH)3 (MW = 107 g/mole) that weighs 150 mg is . a. 0.108 g b. 0.325 g c. 1.355 g d. 4.065 g Amount of Fe2O3 (MW = 160 g/mole) from which 150 mg of Fe(OH)3 (MW = 107 g/mole) may be obtained is . a. 0.112 g b. 0.224 g c. 0.448 g d. none of the other choices
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- Chemistry Calcium in a 5.00 mL urine sample was precipitated, redissolved and required 16.15 mL of 0.1157 N KMnO4. Calculate the % (w/v) of calcium in the urine.Calcium in a 5.00 mL urine sample was precipitated, redissolved and required 16.15 mL of 0.1157 N KMnO4. Calculate the % (w/v) of calcium in the urine.Purification of chromium can be achieved by electrorefining chromium from an impure chromium anode onto a pure chromium cathode in an electrolytic cell. How many hours will it take to plate 10.5 kg of chromium onto the cathode if the current passed through the cell is held constant at 35.0 A? Assume the chromium in the electrolytic solution is present as Cr3+. time:_____ h